Abstract
In a well-ordered society, democratic officials face an assurance problem. They want to ensure that others will
act reasonably when they do the same. According to political liberals, public reason can solve this problem, but the details
of how assurance is generated are unclear. This article explains the assurance mechanism in political liberalism. Apart
from public reason, mutual assurance is also provided by a long-term record of civic deeds. By performing civic deeds over
time, officials signal their reasonableness to each other. This record of civic deeds is costly to unreasonable officials and
thus represents a reliable way to differentiate trustworthy fellows from others. The article also shows that a recent critique
of political liberalism, which argues that public reason is merely cheap talk and thus political liberalism fails to provide
mutual assurance, misses the point. It overlooks that assurance is created through talks and deeds together.